Blagdon B25 High Pressure Diaphragm Pump

Max Capacity: 125 l/min

Max Pressure: 16 bar

Max Viscosity: 5,000 cP

Temperature Range: Limited by elastomers - Up to 180 deg C.

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Blagdon Air Operated Double Diaphragm Pump. 

High Suction, extreme environment pump. Excellent for pumping Paints, Inks, Dyes, Coatings, resins and more.

Fully Submersible Pump. 

Up to 125 l/min at 16 bar


1" Air Operated Diaphragm Pump

Metallic Construction suitable for high-pressure applications

Blagdon Air-Operated Double Diaphragm (AODD) Pumps provide high performance, reliable solutions for your pumping needs. They specalise in extreme condition environments and applications…keeping your process moving both above and below ground. Their AODD pumps have long been recognised as the "workhorse" of the industry for handling difficult liquids at relatively low pressures and flows. The range of applications is virtually limitless!
The pump chambers are alternately filled and emptied by drawing fluid in through a common (suction) inlet, and out through a common (discharge) outlet. The diaphragms in each chamber are linked by a common shaft so that they move backwards and forwards in unison. Compressed air is directed by the air valve alternatively, behind each diaphragm, to power discharge strokes. Pump speed, fluid output and pressure (or head) is controlled by increasing or decreasing the flow of compressed air to the pump.

Common applications:

  • Pumps a vast range of liquids and chemicals
  • Optional Atex certification available
  • Low cost, straight forward construction
  • When electrical power is not available
  • Noise sensitive areas


Pump type: High Pressure Air Operated Double Diaphragm Pump

Control: Valve in air inlet (not included) 

Materials: Metallic casing (see options)

Fluid Connections: 1" (see options)

Max Solid diameter: 3mm

Max Flow rate: 125 litre/min

Displacement: 0.475 litres/stroke

Max Discharge pressure: 16 bar

Air Inlet: 3/8" (see options)

Pump weight: see options list


  • Simple construction, easy to maintain & control
  • Can easily handle high visocity, high SG and high discharge pressure applications.
  • 1″ Threaded Ports
  • ATEX approved as option – intrinsically safe
  • Reliable, proven pneumatic air valve
  • Strong, robust design
  • Manufactured in Shannon, Ireland


Casing materials: Aluminium/Aluminium (25.5kg), Stainless/Aluminium (34.5kg), Stainless/ Stainless (53kg) 

Internal material options: Nitrile, EPDM, Neoprene, Santoprene, PTFE, Viton (FKM)

Fluid Connection options: 1" BSP (F) or NPT (F) Threaded

Air Connection options: 3/8" BSP (F) or NPT (F) Threaded

Like all air operated diaphragm pumps, this pump requires a compressed air source to function.

Need a compressor and pump combo? Check out the compressors in the "Other Products" menu tab. 


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